9
IMPORTANT
NOTE:When checking amperage with the ampmeter,
all louvers must be in place in the cooler,
otherwise incorrect setting of the drive pulley
will occur.
MOTOR PULLEY ADJUSTMENT
NOTE: ALL DUCT CONNECTED COOLERS MUST
BE ADJUSTED.
Long or small air ducts have excessive air resistance
which decreases air output and motor amperage. You may
compensate for this by adjusting the motor pulley. Use a
clamp type ampmeter to check the motor amperage.
1. Check amperage at the white lead in the wiring box.
2. If the amperage is less than the motor nameplate
amperage, loosen the pulley pitch adjustment screw,
turn in the pulley 1/2 turn, tighten the screw and
recheck the amperes. Repeat as necessary to bring
the amperage to the nameplate rating.
3. If the amperage is too high, turn out the pulley as
required.
4. Adjust the belt tension as required. (See page 13)
INSTALLATION
FIGURE 13
STARTUP INSPECTION
Before starting the cooler, make sure all installations and
adjustments are correct. Be sure that:
• Cooler is level and duct is sealed.
• Cabinet is securely fastened to the mount.
• Cooler is grounded. Electrical connections are secure.
• Blower wheel does not rub against housing.
• Water supply is turned on.
• Water line is connected securely and fittings and
crossover tube grommets do not leak.
• Float is adjusted for proper water level.
• Pulley alignment is OK. Belt tension is OK (See page 13).
• Pads are correctly installed (See page 13).
• Blower and both pad motors are plugged into receptacles.
• All louver clips are snapped tight.
STARTUP CHECK LIST
To check out the installation follow this startup proce-
dure. Set the control to each position and check opera-
tion per the following chart. Be sure to open windows or
vents.
OPERATION WITH ESSICK SWITCH ECR-5
(Five Position)
Blower Pad
Switch Motor Motors
Off Off Off
Low Vent Low Off
High Vent High Off
Low Cool Low On
High Cool High On
OPERATION WITH ESSICK SWITCH ECR-7
(Seven Position)
Blower Pad
Switch Motor Motors
Off Off Off
Low Vent Low Off
High Vent High Off
Minimum
Cool — Low Low One On
Minimum
Cool — High High One On
Maximum
Cool — Low Low Both On
Maximum
Cool — High High Both On